SPINK5/SPINT1 protein level ratio in blood (OBA_2055704, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of serine protease inhibitor Kazal-type 5 (human) in blood to amount of Kunitz-type protease inhibitor 1 (human) in blood. Also known as: the ratio of amount of serine protease inhibitor Kazal-type 5 (human) in blood to amount of Kunitz-type protease inhibitor 1 (human) in blood.